limonite

(redirected from limonitic)
Also found in: Dictionary, Thesaurus.

limonite

(līm`ənīt) or

brown hematite

(hĕm`ətīt, hē`–), yellowish to dark brown mineral, a hydrated oxide of iron, FeO(OH)·nH2O, occurring commonly in deposits of secondary origin, i.e., those formed by the alteration of minerals containing iron. Both iron rust and bog iron ore are limonite. It serves as a pigment (see ocherocher
, mixture of varying proportions of iron oxide and clay, used as a pigment. It occurs naturally as yellow ocher (yellow or yellow-brown in color), the iron oxide being limonite, or as red ocher, the iron oxide being hematite.
..... Click the link for more information.
) and as an ore of iron. It is found mainly in Austria and England.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Limonite

 

collective name for natural cryptocrystalline, partially amorphous mineral aggregates comprising various minerals—hydrous trivalent iron oxides (for example, goethite, hydrogoethite, hydrohematite, lepidocrocite). Limonite is formed under exogenous conditions upon decomposition of pyrite and other iron-bearing sulfides, siderite, and iron silicates. It occurs in gossan, laterite, bog ore, and other similar-type formations. Limonite forms large industrial deposits of high-grade iron ore.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

limonite

[′lī·mə‚nīt]
(mineralogy)
A group of brown or yellowish-brown, amorphous, naturally occurring ferric oxides of variable composition; commonly formed secondary material by oxidation of iron-bearing minerals; a minor ore of iron. Also known as brown hematite; brown iron ore.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

limonite

A naturally occurring mineral which is used in high-density concrete because of its high density and water content, making it effective in radiation shielding.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Papangelakis, Behaviour of cobalt during sulphuric acid pressure leaching of a limonitic laterite, Hydrometallurgy, 100, 35 (2009).
At Namibia Minerals there was also a flat of crumbly brown limonitic matrix chunks all studded with sharp, lustrous, single red-brown rutile crystals to 1 cm.
Weathered, disseminated, very fine-grained pyrite imparts a limonitic coating.
Firstly, as applied at Moa Bay, it appeared to be suitable only for limonitic ores with low magnesia content, in order to avoid excessive acid consumption.
It is resistant and form prominent escarpment/cliff with yellow limonitic staining.
Most crystals are 1 cm or less, but single crystals up to over 2 cm were recovered, in thick crusts and intergrown clusters on a blackish to ochre-colored limonitic gossan matrix.
This lower interval is separated from the overlying one (level 10) by a thin (3 to 5 cm thick) micritic, somewhat oolitic layer (9c), wedging out laterally or reduced to few mm thick limonitic crusts.